package com.xiaoxie.cloud.mygateway;

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class MyGlobalFilter implements GlobalFilter, Ordered {

    public static final String BEGIN_VISIT_TIME = "begin_visit_time";

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 记录下访问时间
        exchange.getAttributes().put(BEGIN_VISIT_TIME, System.currentTimeMillis());
        // 统计耗时
        return chain.filter(exchange).then(Mono.fromRunnable(() -> {
            Long beginVisitTime = exchange.getAttribute(BEGIN_VISIT_TIME);
            if(beginVisitTime != null) {
                log.info("访问接口主机：" + exchange.getRequest().getURI().getHost());
                log.info("访问接口端口：" + exchange.getRequest().getURI().getPort());
                log.info("访问接口URL：" + exchange.getRequest().getURI());
                log.info("请求参数：" + exchange.getRequest().getQueryParams());
                log.info("访问接口URL后的参数：" + exchange.getRequest().getURI().getRawQuery());
                log.info("请求耗时：{}ms", System.currentTimeMillis() - beginVisitTime);
                log.info("====================  分割线  ======================");
                System.out.println();
            }
        }));
    }

    /**
     * 数字越小，优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
